Glass and batch for making the same.



- w I E. SCHNELGH, 09F STEUIIBENVIIJLE; @H-lid, ASSIGNOB, BY MJESNE ASSIGN- MENTS, T0 MACBETH-EVANS GLASS COMPANY, 015 PITTSBGH, PENNSYLVAN,

A GOORATION 0F JPJENNSYJLVAN.

nmata.

We Drawing.

To all whom it may concern:

Be it known that I, r A. SoH'NEL- mcn, a citizen of the United States, residing in the city of Steubenville, county of Jefferson, and State of Ohio, have invented new and useful Glass and Batch for Making the Same, of which the following is a specification. t

My invention relates to a new and useful composition for the manufacture. of translucent and opaque glass.

My invention consists in the composition hereinafter specified for the manufacture of translucent and opaque glass.

In the manufacture of my new and improved glam, use the following mixture or batch of ingredients, substantially in the proportions by weight hereinafter indicated, to-wit: sand, 345.8 pounds; litharge, 56.8 pounds; soda ash (carbonate of soda), 86A pounds; cryolite, 20 pounds; aluminum oxid, 60 pounds; niter, 32 pounds; -borax, 8 pounds; plaster of Paris, (calcium sulfate, CaSO 5 pounds 7 1 These ingredients, in substantially these proportions, thoroughly ground, pulverized and mixed, are placed in the ordinary glass pot in a glass-house furnace and heated until entirely fused, with the result that they produce a glass that is translucent, opaque and free from specks; a glass whichwhen pressed into proper shapes for use with electric or gas light, has more than ordinary powers for reflecting and difi'using, and at the same time absorbing but very little of,-

the light with which it is used.

I have discovered that three of the above ingredients, to-wit, cryolite, aluminum oxid and plaster of Paris, when used together in substantially the proportions herein set forth, have the effect of clouding or rendering translucent and at the same time opaque, the ordinary crystal glass which would result from the mixing of-the other ingrediof'a foundation mixture capable when fuse flective powers of the glass manufactured from the ingredients herein specified, is sim, ilar with any batch that will produce the ordinary crystalglass whether made with a lead or a lime base, provided "additional in- Speciflcation of Letters Patent. Patented tlhuume 22,1915, Application filed July ma; fie'ri'al'lto. 71am.

the batch is contained in-the cryolite which is 54.3% fluorin sothat in the 20 pounds of cryolite there are 10.86 pounds of fluorin or 1.77% of the entire batch. The plaster of Paris (CaSO.,) comprises 5 pounds or .81%

of the entire batch, the amount of sulfur in the plaster of Paris being 23.6% thereof or 19% of the total batch.

- As the aluminum, fluorin, and sulfur are the coloring or opacifying agents, other compounds contaimng them might be substituted, provided an adjustment be made to secure the proper amounts of said elements as heretofore set-forth. The amount of the opacifying agents may also be varied de pending upon the opacity desired.

I-claim, 1. A batch for producing glass consistin of a foundation-mixture capable when fuse of producing a substantially colorless glass,

so combined with a sulfate and aluminum and fluorin compounds that the resulting glass will contain undecomposed' sulfate.

2. A batch for producing glass consistin of a foundation mixture capable when fuse of producing a substantially colorless glass, combined with a sulfate and with aluminum and fluorin compounds and free from any material tending to decompose the sulfate at the working temperature of a glass furnace.

3. A batch for producing glass consistin of producing a substantially colorless glass with compounds containing aluminum and fluorin and a sulfate, the amountof aluminum in the batch being in excess of the amount of fluorin, the amount of fluorin bein in excess of that of the sulfurin the sul ate, and the aluminum, fluorin, and sulfur tofiethfir comprising less than 10% of the total ate 

